| 长江口新桥水道潮汐不对称性研究 |
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| 引用本文： | 陈云,戴志军,张敏,梅雪菲.长江口新桥水道潮汐不对称性研究[J].海洋通报,2022(5). |
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| 作者姓名： | 陈云 戴志军 张敏 梅雪菲 |
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| 作者单位： | 华东师范大学 河口海岸学国家重点实验室,上海 200241;上海师范大学 环境与地理科学学院,上海,200234 |
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| 基金项目： | 国家自然科学基金委_中华人民共和国水利部_中国长江三峡集团有限公司长江水科学研究联合基金(U2040202);上海市国际科技合作基金项目（19230712400）;国家自然科学基金面上项目（42076174） |
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| 摘 要： | 涨潮槽是河口重要的地貌类型,其潮汐动力受地形摩擦、径流及风浪等因素影响而发生不对称现象,直接影响槽内
的泥沙动力过程。本文基于实测数据与数值模型计算潮汐不对称偏度,研究长江口南支最大的涨潮槽———新桥水道的潮汐不
对称性及其影响因素。结果表明：（!） 受余流与各分潮的相互作用控制,新桥水道可分为三个区域,上段为涨潮优势区域,
中段为涨落潮转换区域,下段是落潮优势区域。（"） 新桥水道欧拉余流表现出明显的分段差异,上段指向陆而在中下段指向
海并受到径流影响。斯托克斯余流则均指向陆并向陆增强。（''） 新桥水道内中下段潮汐不对称受地形的影响较大,其中扁担
沙的北移增强了新桥水道中段的涨潮优势特性,新的新桥通道的形成促进了新桥水道下段的落潮优势特性。
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| 关 键 词： | 潮汐不对称 涨潮槽 新桥水道 长江口 |
| 收稿时间： | 2021/7/4 0:00:00 |
| 修稿时间： | 2021/11/30 0:00:00 |
Tidal asymmetry of the Xinqiao Channel in the Changjiang Estuary |
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| CHEN Yun,DAI Zhijun,ZHANG Min,MEI Xuefei.Tidal asymmetry of the Xinqiao Channel in the Changjiang Estuary[J].Marine Science Bulletin,2022(5). |
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| Authors: | CHEN Yun DAI Zhijun ZHANG Min MEI Xuefei |
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| Institution: | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 20241, China;School of Environmental and Geographical Sciences, Shanghai Normal University, Shanghai 200234, China |
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| Abstract: | Flood channel is an important geomorphological type in the estuary. Under the influence of topography, runoff and wind wave, tidal dynamics of flood channel exhibits asymmetry, which directly affects the dynamical sedimentary processes of the channel. Based on measured data and numerical model, tidal asymmetry of Xinqiao Channel, the largest flood channel in the South Branch of the Changjiang Estuary, and its influencing factors are explored. The results show that: (1) under the control of the interaction between residual current and tidal constituents, Xinqiao Channel can be divided into three sub-reaches: the upper channel is flood dominance, the middle channel is the transition area between flood dominance and ebb dominance, and the lower channel is ebb dominance; (2) Euler residual current in the Xinqiao Channel shows obvious spacial differences, with the upper channel towarding to land while the middle-lower channel towarding to sea and being affected by runoff. Stokes residual current along the entire channel towards to land and strengthens landward; (3) Tidal asymmetry in the middle-lower Xinqiao Channel is greatly affected by topography. Specifically, the north moving of Biandan Shoal enhances the flood advantage in the middle Xinqiao Channel, while the formation of Xinxinqiao Channel promotes the ebb advantage in the lower Xinqiao Channel. |
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| Keywords: | Tidal asymmetry flood channel Xinqiao Channel Changjiang Estuary |
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